Rotary drier



Dec. 30,1930, W; A. HAR'II'Y I ET AL ROTARY DRIER Fli'led ma 5, 1928 amnion! Iii/Ilia! mwzmw a m @x Q IIIM. ll: i Q i & 7 W |1| g Patented Dec. 30, 1930 PATENT OFFICE WILLIAM A. HARTY, OF'BUFFALO, NEW YORK, AND FRANK W. MOORE, F THOROIID, ONTARIO, CANADA, ASSIGNORS TO HARMOR & O0. INCL, OF BUFFALO, NEW YORK,

A CORPORATION OF NEW YORK ROTARY DRIER Application filed May 5,

Our present invention relates to driers of the rotating hollow core type, wherein the drying heat is projected through the rotating core or mandrel and the material to be dried is in direct contact therewith. Such a drier is shown in our Reissue Patent No. 16,265, reissued February 16, 1926, to which reference is made as illustrating a type of drier which has now become standard in the art.

More particularly our present invention relates to an automatic feed for such a drier whereby the material to be dried is automatically fed into the drying chamber surrounding the hot core or mandrel and during such feed is subjected to what may be described as a pro-heating treatment of preliminary drying before its actual delivery into the drying chamber itself.

To this end, we provide the hot core or mandrel with an extension which projects beyond the intake end of the drier shell and onto which the material to be dried is deposited either by hand or by gravity and by which it is given a preliminary heating.

Associated with this extension, either as a.

concentric or a subjacent feed is a screywconveyor in the form of a helix for advancing the material along said extension into the drying chamber.

In addition to its feeding function, the

screw conveyor serves as an agitator to agi tate the material thoroughly during such advance and in the case of the concentric screw the individual fins of the helix serve as radiating members to transfer the heat from the hot core or mandrel directly to and through he material being dried.

In this manner we secure a preliminary heating of the material prior to its delivery into the drying chamber as well as an auto- 1928. Serial No. 275,361.

V] e have shown in the accompanying drawings several embodiments of our invention for-attaining these results, Fig. 1 being an elevation, partly in section, of a rotary drier of our general type equipped with one embodiment of our invention,

Fig. 2 an end view at the intake end of the drier shell as seen from the left of Fig. 1.

Fig. 3 a side elevation at the intake end of the shell and showing a modification.

Fig. 4 an end view of Fig. 3.

Fig. 5 a View corresponding to Fig. 3 but showing a still further modification, and

Fig. 6 a detail view of one of the removable blades or tins of the screw conveyor shown in Fig. 5.

As in our prior patents the drier consists of a rotary shell 1 and an internalhollow core or hot mandrel 2 rotating with said shell and preferably extending the full length thereo f.

For convenience of shipment or replacement of parts the shell and mandrel may be in sections, the mandrel sections telescopically fitting one within the other and being suspended within the shell by means of a plurality of spring suspension members 3 which. are specially designed. to overcome the effects of expansion and contraction.

The mandrel sections are provided with longitudinally extending heat radiating ribs 2 and the shell sections are provided internally thereof with a plurality of lifting flanges l which lift the material being dried and cascade it onto the hot mandrel.

The hollow mandrel 2 is of suiiiciently smaller diameter than the internal diameter ofthe shell 1 to provide therebetween a continuous drying chamber 4 into which the material to bedried is fed from the intake end of the drier which is at the left in Fig. l.

As in our prior application, Serial No. 7

228,212, the shell sections are provided with circumferential tires 5 running on suitable rollers 6 on the supports for the drier. If the metal supporting bases 7 and 8 shown in these drawings are used as supports for the shell, thetires run on a pair of spaced'vertically disposed rollers 6 mounted on the base frames. These rollers may conveniently serve as ground wheels when the bases are up-ended and used as wheeled trucks for moving the drier from place to place.

The drier shell and with it the mandrel 2 are rotated in any suitable manner. lVhere a direct drive is desired, a motor M may be mounted on the supporting base 7, and the motor shaft 9 is provided with a sprocket 10 which is connected by a chain 11 with a sprocket 12 on the drier shell. Obviously, however, other drives may be used, as desired.

As contemplated herein the material to be dried is automatically fed into the intake end of the drying chamber and during such feed is subjected to a preliminary heat treatment which drives out some of the entrained moisture.

To this end the mandrel tube is provided with an extension indicated generally at 13 in Figs. 1 and 2 and as shown 111 sa1d Figs.

enclosed within a casing 14 of generally trough shape. The material to be dried CllS charges by grav ty into the upper openend of said casing 145 through the feed pipe 15 drawings, we provide a burner nozzle 16 dis charging directly into the firing end of the mandrel extension 13.

The material is fed along or adjacent to the mandrel extension in direct contact therewith by any suitable feed means. As shown in Figs. 1 and 2 the automatic feed consists of a screw conveyor 17, arranged in the lower part of the casing 1 1 immediately beneath the mandrel extension 13. i

The shaft of said conveyor may be driven in any desired manner. In Fig. 1 we have shown a convenient drive in which the motor M is utilized as the driving source. To this end the motor shaft 9 is extended and is belted as indicated at 18'to the outer end of the screw shaft which projects beyond the casing In the modifications shown in Figs. 3 and V 4 the-feed screw 17 isshown as welded or otherwise secured to the mandrel extension 13, concentric therewith, the mandrel extension and screw being encased within the open topped generally trough shaped casing 14 as in Figs. '1 and 2.

In the further modifications shown in Figs.

vancing the material along the hot mandrel extension in direct contact therewith into the drier chamber, of agitating 'the material thoroughly during such advance, and in the case of the concentric screw of'radiating the heat from the hot mandrel extension into and through the material being dried.

We have shown the screw conveyor in each instance as terminating within the intake end of the drier chamber and ordinarily a .conveyor of this length is sufiicient because the longitudinal ribs of the mandrel tube 2 and the lifting flanges of the shell can then pick up the material and continue its feed through the drier chamber. Similarly, various other v modifications in the construction and relation of the parts may be resorted to within the spirit and scope of our invention as defined by the appended claims.

What we therefore claim and desire to secure by Letters Patent is:

1. A drier comprising a rotary shell and an internal hollow mandrel rotating therewith and extending beyond the intake end of the shell as a firing end, a drive shaft and driving connections to said shell, and a conveyor disposed beneath said mandrel exten sion and driven from said drive shaft.

2. A drier comprising'a rotary shell and and internal hollow mandrel rotating therewith and extended beyond the intake end of said shell as a firing end, a casing disposed about the mandrel extension and open at its upper side for the feed of material into said extension, a screw conveyor disposed longitudinally within said casing beneath said extension, a drive shaft, and driving connections from said shaft respectively to said rotary shell and to said screw conveyor.

In testimony whereof we affix our 'signa tures.

\NILLIAM A. HARTY. FRANK 1V. MOORE. 

